Quantitative studies in fetal electrocardiography. II. Distribution of basic data, twin and sex differences.
D001724:Birth Weight; D004562:Electrocardiography; D005260:Female; D005318:Fetal Heart / Q000502:physiology*; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D012727:Sex Characteristics; D013223:Statistics as Topic; D014427:Twins